As part of this project, I worked with an interuniversity group of two professors, one graduate student, and three undergraduates, including myself. We worked on an extension of the floating wetland concept, which serves to use natural wetland plants to treat water pollution. Our project focused on automating the process, using sensors and actuators to move a floating wetland to the optimal spot to absorb excess nitrates.
In this project, I served as mechanical lead, designing the housing for the electronics and sensors, as well as the electrical lead, designing the wiring for the sensors as well as programming the arduino to read them. The main challenge was designing the electronics box to be as waterproof as possible, as we wanted the final product to survive even if the structure were to fail. To accomplish this, I used a commercial plastic box, and drilled the holes to be as precise as possible to fit the sensors and other exterior components. If I were to redesign this, I would use some waterproof stoppers, such as rubber, to fill the holes after the sensors were inserted to improve the water resistance of the electronic box.
I later would continue this research as part of my AP Capstone Project, where I continued development of the overall structure of the product. I was unsatisfied with the original design, which used foam, which has the potential to break apart easily. Therefore, the second iteration of the design used stronger materials, such as PVC, and included housings for buoyant components. This modular design made easy repairs possible, as well as potential mass production.
Overall, this project has much room for improvement and further development with a larger team and more experience. Some examples of this improvement include more research into different plant choices, a more effective algorithm for nitrate detection, or a renewable power supply such as solar.